CN119553977A - Horizontal well coiled tubing stuck releasing method and stuck releasing system - Google Patents
Horizontal well coiled tubing stuck releasing method and stuck releasing system Download PDFInfo
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Abstract
本发明涉及连续管作业技术领域，特别是涉及一种水平井连续管遇卡解卡方法及解卡系统，所述解卡方法包括：在水平井连续管冲砂、钻磨作业中，当出现井口失返而卡钻时，增大正循环连续管排量，上下活动连续管解卡，若无法解卡，向连续管与套管的环空泵注液氮，同时连续管内泵注冲砂钻磨液体，直至完成解卡作业；在该过程中，若液氮泵注超压则停泵，连续管内继续泵注冲砂钻磨液体，直至出现连续管载荷吨位上涨或油、套压差降低的现象，再继续环空泵注液氮，同时连续管逐步降低泵注排量，直至连续管悬重基本正常；然后提升连续管排量并上下活动连续管，直至完成解卡作业。通过本解卡方法及解卡系统，能有效解决解卡难度大、耗时长和成本高的问题。
The present invention relates to the technical field of coiled tubing operation, and in particular to a method and system for releasing stuck coiled tubing in horizontal wells. The release method comprises: in the sand flushing and drilling and grinding operation of the coiled tubing in the horizontal well, when the wellhead is lost and the drill is stuck, the displacement of the positive circulation coiled tubing is increased, and the coiled tubing is moved up and down to release the stuck. If the stuck cannot be released, liquid nitrogen is pumped into the annulus between the coiled tubing and the casing, and the sand flushing and drilling and grinding liquid is pumped into the coiled tubing at the same time until the release operation is completed; in this process, if the liquid nitrogen pumping is overpressured, the pump is stopped, and the sand flushing and drilling and grinding liquid is continued to be pumped into the coiled tubing until the load tonnage of the coiled tubing increases or the pressure difference between the oil and the casing decreases, and then the annulus is continued to be pumped with liquid nitrogen, and the pumping displacement of the coiled tubing is gradually reduced until the suspended weight of the coiled tubing is basically normal; then the displacement of the coiled tubing is increased and the coiled tubing is moved up and down until the release operation is completed. The release method and release system can effectively solve the problems of difficulty, time consumption and high cost in releasing stuck.
Description
Technical Field
The invention relates to the technical field of continuous pipe operation, in particular to a horizontal well continuous pipe stuck releasing method and a stuck releasing system.
Background
The unconventional oil and gas reservoir development at home and abroad mainly adopts the technical thought of horizontal well and volume fracturing, and usually adopts a bridge plug staged clustering fracturing process or a coiled pipe staged cutting fracturing process to carry out staged sand fracturing so as to realize the full transformation of a reservoir. After the fracturing transformation is completed, the well bore is blocked in the drainage stage due to sand discharge and soluble bridge plug residues in the fracturing stage, so that the production of an oil and gas well is affected, and the well bore is generally cleaned in a sand washing or drilling and grinding mode. Compared with the conventional oil pipe shaft cleaning operation, the continuous pipe is used for shaft cleaning operation, the construction period is short, and the whole-process pressurized operation basically has no well control and environmental protection risks, so that in the development of unconventional oil and gas fields, the continuous pipe is often used for sand washing or drilling and grinding operations at home and abroad.
In sand washing or drilling and grinding operation, the drilling and grinding device is influenced by factors such as casing abnormality, tool or equipment failure, sand washing and grinding liquid leakage, improper personnel operation and the like, and drill sticking accidents occur. Compared with the conventional oil pipe, the coiled tubing has the characteristics of small pipe diameter, low strength and the like, when the coiled tubing is washed out of sand or drilled and ground and blocked, the effective lifting of pumping displacement cannot be realized, the fracturing sand or drill cuttings of the well bore near the blocked point are carried out of the well bore through an oil sleeve annulus, meanwhile, the coiled tubing is difficult to unblock by means of low-tonnage activity, and the broken well of the coiled tubing is easily caused by the lifting of the coiled tubing in a large-tonnage manner, so that the accident is further complicated. At present, the only processing mode is through fishing, namely, the processing is performed by adopting the modes of pipe cutting, milling and sand washing and fishing, and the problems of high difficulty, long time consumption and high cost of the unclamping processing are solved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a horizontal well coiled tubing stuck-in-stuck-out method and a stuck-out system, which can effectively solve the problems of high stuck-out difficulty, long time consumption and high cost.
The invention is realized by adopting the following technical scheme:
A method for releasing a horizontal well coiled tubing when encountering a card comprises the following steps:
Step S 1, when the wellhead is lost and the drill is stuck, increasing the displacement of the positive circulation continuous pipe, and if the continuous pipe cannot be stuck, entering step S 2;
And S 2, pumping liquid nitrogen into the annular space of the continuous pipe and the sleeve, pumping sand washing, drilling and grinding liquid into the continuous pipe until the unclamping operation is completed, stopping pumping if the liquid nitrogen is pumped into the annular space, continuing pumping sand washing, drilling and grinding liquid into the continuous pipe until the phenomenon of rising of the load tonnage of the continuous pipe or reduction of oil and sleeve pressure difference occurs, continuing pumping liquid nitrogen into the annular space, simultaneously gradually reducing the pumping displacement of the continuous pipe until the suspended weight of the continuous pipe is basically normal, and then lifting the displacement of the continuous pipe and moving the continuous pipe up and down until the unclamping operation is completed.
Before pumping sand washing drilling and grinding liquid into the continuous pipe, the continuous pipe is pressed down to be in a compressed state.
The overpressure specifically refers to exceeding a preset overpressure protection value, which is lower than the casing pressure limit.
And if the pressure value of the annular liquid nitrogen is reduced by more than 5MPa, continuing to pump the liquid nitrogen into the annular liquid, and maintaining the pressure value to be a stable value.
In the unlocking operation process, if the pressure difference between the oil and the sleeve is increased, the pumping discharge capacity of the continuous pipe is improved.
The utility model provides a horizontal well coiled tubing meets card system that breaks, includes liquid nitrogen pump notes equipment and sand washing brill grinds liquid pump notes equipment, liquid nitrogen pump notes equipment is used for annotating liquid nitrogen to coiled tubing and sheathed tube annular space pump, sand washing brill grinds liquid pump notes equipment is used for pumping the sand washing brill grinds liquid to the coiled tubing in the pump when annotating liquid nitrogen.
The liquid nitrogen pumping equipment comprises a liquid nitrogen source, a first communication pipe and a first flowback valve which are sequentially connected, wherein the other end of the first flowback valve is communicated with an annular space of the continuous pipe and the sleeve, a liquid nitrogen pump truck and a first plug valve are further arranged on the first communication pipe, the sand washing drilling and grinding liquid pumping equipment comprises a sand washing drilling and grinding liquid storage tank and a second communication pipe which are sequentially connected, the other end of the second communication pipe is communicated with the continuous pipe, and a pump truck and a second plug valve are further arranged on the second communication pipe.
The device further comprises a third communicating pipe, wherein a third plug valve is further arranged on the third communicating pipe, a fourth plug valve is further arranged on the second communicating pipe, one end of the third communicating pipe is communicated with a first communicating pipe between the first plug valve and the first flow-back valve, and the other end of the third communicating pipe is communicated with a second communicating pipe between the fourth plug valve and the second plug valve.
And a filter is further arranged on the second communicating pipe.
The sand setting device further comprises a second flowback valve, an open-flow choke manifold and a sand setting tank which are sequentially connected, wherein the second flowback valve and the continuous pipe are communicated with the annular space of the sleeve, and the other end of the sand setting tank is connected with a sand washing drilling and grinding liquid storage tank through a fourth communicating pipe.
Compared with the prior art, the invention has the beneficial effects that:
1. In the invention, liquid nitrogen is pumped into the annular space, and the liquid nitrogen is gasified into nitrogen before entering the annular space, so that the permeation effect of the gas under the action of pressure difference is better. Further, since the gas is transported from the high pressure end to the low pressure end and has expansion property, the volume of the nitrogen gradually expands in the process of seeping from the upper annulus to the lower shaft, and the expanded volume of the nitrogen can gradually push the sand plugs close to the lower shaft from far to near gradually and push the sand plugs to the far end of the lower shaft, so that the sand plugs between the coiled tubing and the annulus are completely pushed and spread out, and even most sand grains are swept to the lower shaft far from the drilling tool, and the sand plugs are eliminated to finish unclamping. The liquid is continuously pumped into the continuous pipe while the liquid nitrogen is pumped, so as to balance the pressure difference between the inside and the outside of the continuous pipe and avoid the continuous pipe from being extruded.
The invention provides a simple, efficient and economic continuous pipe unclamping method, which can solve the problem that the conventional suspending, circulating and movable unclamping treatment success rate is low, and the problems of high difficulty, long time consumption and high cost of the through fishing unclamping treatment in the prior art are solved.
2. In the invention, before pumping sand washing, drilling and grinding liquid into the continuous pipe, the continuous pipe is pressed down to be in a compression state instead of a stretching state (the wall thickness is thinned and the strength is reduced in the stretching state), so that the extrusion deformation of the continuous pipe can be effectively avoided.
3. The invention sets a mechanism for stopping the pump by overpressure, fully considers the existing strength of the continuous pipe and the pressure limit of the sleeve, and ensures that the unlocking process is safer.
4. In the liquid nitrogen pumping process, the pressure value is kept at a stable value, so that the nitrogen pressure of the upper annular space on the sand piston can be increased as much as possible under the condition of casing pressure limiting, the seepage flow can be increased as much as possible, and the unclamping effect is improved.
5. The stuck freeing system comprises liquid nitrogen pumping equipment and sand washing, drilling and grinding liquid pumping equipment, can pump liquid nitrogen into the annular space of the continuous pipe and the sleeve, pumps sand washing, drilling and grinding liquid into the continuous pipe, and can solve the stuck accident of sand or fragments to the stuck state in the sand washing, drilling and grinding operation of the continuous pipe of the horizontal well.
6. According to the invention, through the design of the third communicating pipe, the third plug valve and the fourth plug valve, liquid nitrogen can be pumped into the continuous pipe, sand washing drilling and grinding liquid can also be pumped into the annular space between the continuous pipe and the sleeve, liquid nitrogen can be pumped into the continuous pipe and the annular space between the continuous pipe and the sleeve at the same time, or sand washing drilling and grinding liquid can be pumped into the continuous pipe and the annular space between the continuous pipe and the sleeve at the same time, and the unclamping process can be selectively used according to actual conditions.
7. Through setting up of second flowback valve, open-flow choke manifold and sand setting jar, can realize the collection and the cyclic utilization of sand washing brill grinding liquid.
8. And a filter is further arranged on the second communicating pipe and is mainly used for filtering circulating sand washing drilling and grinding fluid.
Drawings
The invention will be described in further detail with reference to the drawings and detailed description, wherein:
FIG. 1 is a schematic diagram of a card unlocking system according to the present invention;
FIG. 2 is a schematic illustration of a coiled tubing sand stuck (clastic) wellbore in accordance with the present invention;
the marks in the figure:
1. Liquid nitrogen source, 2, first communicating pipe, 3, first flowback valve, 4, continuous pipe, 5, liquid nitrogen pump truck, 6, first plug valve, 7, sand washing drilling and grinding liquid storage tank, 8, second communicating pipe, 9, pump truck, 10, second plug valve, 11, third communicating pipe, 12, third plug valve, 13, fourth plug valve, 14, filter, 15, second flowback valve, 16, open flow throttle manifold, 17, sand setting tank, 18, annular pressure, 19, sand plug, 20, wellbore pressure.
Detailed Description
Example 1
As a basic implementation mode of the invention, the invention comprises a method for releasing the horizontal well coiled tubing when encountering a card, which comprises the following steps:
Step S 1, when the well head is lost and the drill is stuck, the displacement of the positive circulation continuous pipe 4 is increased, and if the continuous pipe 4 can not be stuck, the step S 2 is carried out.
And S 2, pumping liquid nitrogen into the annular space of the continuous pipe 4 and the sleeve, and pumping sand washing, drilling and grinding liquid into the continuous pipe 4 until the unclamping operation is completed. In the process, if the liquid nitrogen is pumped for overpressure, the pump is stopped, pumping sand washing, drilling and grinding liquid is continuously pumped in the continuous pipe 4 until the phenomenon that the load tonnage of the continuous pipe 4 is increased or the oil and sleeve pressure difference is reduced occurs, annular pumping of liquid nitrogen is continuously performed, and meanwhile, the pumping displacement of the continuous pipe 4 is gradually reduced until the suspended weight of the continuous pipe 4 is basically normal. Then properly lifting the displacement of the continuous tube 4 and moving the continuous tube 4 up and down until the unclamping operation is completed.
Example 2
As a preferred embodiment of the invention, the invention comprises a method for releasing a horizontal well coiled tubing when encountering a card, comprising the following steps:
Step S 1, when the well head is lost and the drill is stuck, the displacement of the positive circulation continuous pipe 4 is increased, and if the continuous pipe 4 can not be stuck, the step S 2 is carried out.
Step S 2, setting an overpressure protection value under the casing pressure limit taking into account the existing strength of the coiled tubing 4 and the casing pressure limit. Liquid nitrogen is pumped into the annular space of the continuous pipe 4 and the sleeve, and meanwhile, sand washing, drilling and grinding liquid is pumped into the continuous pipe 4 until the unclamping operation is completed. Wherein, before pumping sand washing, drilling and grinding liquid into the continuous pipe 4, the continuous pipe 4 is pressed down to be in a compression state instead of a stretching state, so that the continuous pipe 4 is prevented from being crushed and deformed.
In the process of pumping liquid nitrogen and sand washing drilling and grinding liquid, if the liquid nitrogen pump is used for pumping overpressure, namely the pressure exceeds a preset overpressure protection value, the pump is stopped, and the sand washing drilling and grinding liquid is continuously pumped in the continuous pipe 4. Closely related to oiling, sleeve pressure change and continuous pipe 4 load change, if the phenomena of continuous pipe 4 load tonnage increase or oil and sleeve pressure difference decrease and the like occur, the phenomenon that fragments (fracturing sand or drilling and grinding fragments) which cause drill sticking are loosened is indicated, annular liquid nitrogen is pumped continuously, and simultaneously, the continuous pipe 4 gradually reduces pumping displacement until the suspended weight of the continuous pipe 4 is basically normal. Then properly lifting the displacement of the continuous tube 4 and moving the continuous tube 4 up and down until the unclamping operation is completed.
Example 3
As another preferred embodiment of the invention, the invention comprises a horizontal well coiled tubing stuck freeing system which comprises liquid nitrogen pumping equipment and sand washing drilling and grinding liquid pumping equipment. The liquid nitrogen pumping device is used for pumping liquid nitrogen into the annular space of the continuous pipe 4 and the sleeve, and meanwhile, the sand washing drilling and grinding liquid pumping device is used for pumping sand washing drilling and grinding liquid into the continuous pipe 4.
Specifically, the liquid nitrogen pumping equipment comprises a liquid nitrogen source 1, a first communication pipe 2 and a first flowback valve 3 which are sequentially connected, wherein the first flowback valve 3 is communicated with the annular space of the continuous pipe 4 and the sleeve. The first communication pipe 2 is also provided with a liquid nitrogen pump truck 5 and a first plug valve 6. The sand washing drilling and grinding liquid pumping equipment comprises a sand washing drilling and grinding liquid storage tank 7 and a second communicating pipe 8 which are sequentially connected, the other end of the second communicating pipe 8 is communicated with the continuous pipe 4, and a pump truck 9 and a second plug valve 10 are further arranged on the second communicating pipe 8.
The system is utilized for unlocking, and the specific unlocking flow is as follows:
The first flowback valve 3, the first plug valve 6 and the second plug valve 10 are opened. Simultaneously, the liquid nitrogen pump truck 5 and the pump truck 9 are started, and an overpressure protection value is set, and if the sleeve pressure is limited to 55MPa, the highest overpressure protection value can be set to 54MPa. After the running state of the equipment is stable, sand washing, drilling and grinding liquid is pumped into the continuous pipe 4 through the second plug valve 10, meanwhile, liquid nitrogen is pumped into the annular space of the continuous pipe 4 and the sleeve through the first plug valve 6 and the first flowback valve 3, and the liquid nitrogen is continuously pumped until the pump stops at overpressure. And closing the first flowback valve 3, and continuously pumping the continuous pipe 4 according to the set displacement. The process is closely related to oil injection, sleeve pressure change and continuous pipe 4 load change, and if the oil and sleeve pressure difference is increased, the pumping displacement of the continuous pipe 4 can be properly improved. When the suspension weight of the continuous pipe 4 rises and the oil and sleeve pressure difference is reduced, the phenomenon that fragments (fracturing sand or drilling and grinding fragments) which cause the drill sticking are loosened is indicated, and the continuous pipe 4 is pumped continuously. And (3) improving the displacement of the continuous pipe 4, simultaneously, moving the continuous pipe 4 up and down and taking off in a short distance until the drilling tool is dragged out of the predicted well section when encountering the blockage, and ending the blockage releasing operation.
Example 4
As the best mode of the invention, the invention comprises a horizontal well coiled tubing jamming and unlocking system, and referring to the attached figure 1 of the specification, the invention comprises liquid nitrogen pumping equipment and sand washing drilling and grinding liquid pumping equipment. The liquid nitrogen pumping equipment comprises a liquid nitrogen source 1, a first communication pipe 2 and a first flowback valve 3 which are sequentially connected, wherein the first flowback valve 3 and the continuous pipe 4 are communicated with the annular space of the sleeve. The first communication pipe 2 is also provided with a liquid nitrogen pump truck 5 and a first plug valve 6. The liquid nitrogen source 1 is a liquid nitrogen tank car. The sand washing drilling and grinding liquid pumping equipment comprises a sand washing drilling and grinding liquid storage tank 7 and a second communicating pipe 8 which are sequentially connected, the other end of the second communicating pipe 8 is communicated with the continuous pipe 4, and a pump truck 9 and a second plug valve 10 are further arranged on the second communicating pipe 8.
Further, the device also comprises a third communicating pipe 11, a third plug valve 12 is further arranged on the third communicating pipe 11, and a fourth plug valve 13 is further arranged on the second communicating pipe 8. One end of the third communicating pipe 11 is communicated with the first communicating pipe 2 between the first plug valve 6 and the first flowback valve 3, and the other end is communicated with the second communicating pipe 8 between the fourth plug valve 13 and the second plug valve 10.
Further, in order to realize the recycling of the sand washing drilling and grinding liquid, the sand washing drilling and grinding device further comprises a second flowback valve 15, a blowout choke manifold 16 and a sand setting tank 17 which are connected in sequence. The second flowback valve 15 and the continuous pipe 4 are communicated with the annular space of the sleeve, the other end of the sand setting tank 17 is connected with the sand washing drilling and grinding liquid storage tank 7 through a fourth communicating pipe, and a pump body can be arranged on the fourth communicating pipe.
Further, in order to filter the circulating sand washing drilling and grinding fluid, a filter 14 is further disposed on the second communicating pipe 8.
The horizontal well coiled tubing is used for unlocking when encountering a card, and the specific unlocking method is as follows:
Step S 1, when the well head is lost and the drill is stuck, the displacement of the positive circulation continuous pipe 4 is increased, and if the continuous pipe 4 can not be stuck, the step S 2 is carried out.
And S 2, pumping liquid nitrogen into the annular space of the continuous pipe 4 and the sleeve, and pumping sand washing, drilling and grinding liquid into the continuous pipe 4 until the unclamping operation is completed. Specifically, the method comprises the following steps:
Step S 21, the continuous pipe 4 is pressed down to the hanging weight of-8 t, the third plug valve 12 is closed, and the first flowback valve 3, the first plug valve 6, the second plug valve 10 and the fourth plug valve 13 are opened.
And step S 22, simultaneously starting the pump truck 9 and the liquid nitrogen pump truck 5, and setting an overpressure protection value, wherein the overpressure protection value is lower than the sleeve pressure limit, and if the sleeve pressure limit is 55MPa, the maximum overpressure protection value can be set to be 54MPa. After the operation state is stable, pumping sand washing, drilling and grinding liquid through the continuous pipe 4 through the second plug valve 10 and the fourth plug valve 13, determining the displacement according to the pipe diameter, wherein the displacement of the 2 'continuous pipe 4 is 100L/min, the displacement of the 2 3/8' continuous pipe 4 is 150L/min, and simultaneously pumping liquid nitrogen through the first plug valve 6 and the first flowback valve 3, pumping liquid nitrogen through an oil sleeve annulus, wherein the displacement of the liquid nitrogen is 150-200L/min, and continuously pumping liquid nitrogen until the pump stops at overpressure.
And S 23, closing the first flowback valve 3, and continuously pumping the continuous pipe 4 according to the set displacement. The process is closely related to oil injection, sleeve pressure change and continuous pipe 4 load change, and if the oil and sleeve pressure difference is increased, the pumping displacement of the continuous pipe 4 can be properly improved.
Step S 24, when the suspended weight of the continuous pipe 4 rises and the oil and casing pressure difference is reduced, the phenomenon that fragments (fracturing sand or drilling and grinding fragments) which cause the drill sticking are loosened is indicated, and the continuous pipe 4 is pumped continuously. If the normal suspended weight of the continuous pipe 4 is 8t, and when the suspended weight is recovered to be more than or equal to 6t, the suspended weight of the continuous pipe 4 is considered to be basically recovered to be normal.
Step S 25, the displacement of the continuous pipe 4 is increased, the displacement of the 2 'continuous pipe 4 is generally increased to 600L/min, the displacement of the 2 3/8' continuous pipe 4 is generally increased to 750L/min, meanwhile, the continuous pipe 4 is moved up and down and is lifted down in a short distance, until a drilling tool is dragged out of a predicted well section when encountering a jam, and the jam releasing operation is finished.
In the above-mentioned unclamping method, referring to fig. 2 of the specification, if sand jamming (chip jamming) occurs during sand washing or drilling and grinding of the coiled tubing 4, the lifting and lowering of the tubular string are not reacted, namely, in case of thorough jamming, the sand plug 19 and the coiled tubing 4 separate the well bore into an upper oil casing annulus and a lower well bore.
The wellbore pressure 20 is often relatively low, typically below 10MPa, during sand washing or drilling operations of the coiled tubing 4.
Assuming that the permeability of the sand plug 19 is k and the final annular pressure 18 after the annular pumping of liquid nitrogen is P1, the method is based on the Darcy seepage formula:
in the above formula, each parameter is:
liquid nitrogen pressure in the upper annulus of the P1-sand plug 19;
P2-sand plug 19 lower wellbore pressure;
A-annulus cross-sectional area;
k-permeability coefficient of liquid nitrogen or sand washing drilling and grinding liquid;
u- -dynamic viscosity of liquid nitrogen or sand wash drilling and grinding fluid;
l-length of sand plug 19 in the wellbore.
In the method for releasing the liquid nitrogen pumped in the annular space, the parameters of the Darcy formula are relatively fixed except P1. In order to ensure the seepage rate Q of nitrogen or sand washing drilling and grinding liquid, the value of P1 should be improved as much as possible under the condition of casing pressure limitation. Therefore, in the actual unclamping operation, if the casing pressure is limited by 55MPa, pumping liquid nitrogen into the annular space until the pressure value gradually tends to a stable value, wherein the stable value is a value that the pressure tends to be stable and unchanged after pumping, and the stable value is related to the sand plug. In this embodiment, the stable value may be 54MPa, and when the pressure value of the annular nitrogen decreases by more than 5MPa, liquid nitrogen may be continuously pumped into the annular space, and P1 is maintained at 54MPa.
The liquid nitrogen is gasified into nitrogen before entering the annular space, once the annular nitrogen enters the lower shaft through the sand plug, according to an ideal gas state equation pv=nrt, under the shaft condition, the quantity n of the nitrogen material, the gas constant R and the thermodynamic temperature T of the shaft can be considered unchanged, and the following formula can be obtained:
P1×V1=P2×V2
in the above formula, each parameter is:
p1-nitrogen pressure of the upper annulus;
v1-the nitrogen volume of the upper annulus;
P2-Nitrogen pressure of the lower wellbore;
V2-nitrogen volume of lower wellbore;
From the above equation, since P1> P2, V1< V2 means that the gas has an expansion property when moving from the high pressure end to the low pressure end, then the volume of nitrogen gradually expands during the process of seeping from the upper annulus to the lower well bore, and the volume of the expanded nitrogen gradually pushes the sand plug 19 close to the lower well bore from far to near gradually and pushes the sand plug to the far end of the lower well bore, so that the sand plug between the coiled tubing and the annulus is completely pushed and spread out, and even most of sand grains are swept to the lower well bore far from the drilling tool position, and the sand plug is eliminated to complete the unclamping.
Example 5
As another preferred embodiment of the invention, the invention comprises a method for releasing the horizontal well coiled tubing when encountering a card. The well is an oil horizontal well, an artificial well bottom 4427m, a deflecting point 560m, a window inlet point 2424m, a horizontal section length 2087m, a casing completion, and a casing outer diameter 139.7mm and an inner diameter 124.26mm. The fracturing process is carried out by adopting a coiled tubing 4 bottom seal dragging fracturing process to fracturing and reform 56 sections, after fracturing, a coiled tubing 4 of 2.375in is used for flushing sand into a well, a ground choke manifold controls the back pressure to be between 2.2 and 4.4MPa through a 16mm choke, the period is shortened, the back dragging is carried out for 6 times, the accumulated sand return amount is about 8m 3, when the coiled tubing is flushed to 3672m and dragged back to 2627m, the wellhead is lost, the wellhead pressure is reduced to 0 from 3.9MPa, the lifting is carried out, the maximum lifting force is 18.4t (the normal suspension weight is 16t when the back dragging), a lateral wing channel on the other side of the christmas tree is opened, the choke manifold is adjusted to an in-line channel (without oil nozzle), the pumping displacement of the coiled tubing 4 is 700-900L/min, and the wellhead is still lost.
And in the unclamping stage 1, lifting the continuous pipe 4 is stopped, and the displacement is increased to try to unclamp the movable continuous pipe 4. Specifically, the pumping displacement is increased, the flow back outlet intermittently discharges liquid, the flow back displacement is 20-500L/min, the movable drilling tool is tried to be lifted and pressed down, the maximum lifting force is 18.4t, the pressing force is-8 t, and the movable stuck releasing is unsuccessful.
And in the unclamping stage 2, pumping liquid nitrogen into the continuous pipe 4, supplementing energy to the stratum, observing the change of a return outlet, and unclamping the continuous pipe 4 according to the situation. Specifically, the continuous tube 4 is pressed down to-8 t, 19.1m 3 of liquid nitrogen is pumped from the tube, after 6 hours, trace liquid is discharged from the return outlet, liquid discharge is stopped after about 1-2 minutes, a stream of liquid is returned about every 3-4 minutes after the liquid nitrogen pump is stopped for about 6 hours, about 10-20L is stopped after about 1 hour, liquid discharge is stopped, 38.4m 3 of liquid nitrogen is pumped from the tube again, the continuous tube is moved for 4 hours at the interval of maximum pressing force-8 t to maximum lifting force-15 t, after 2 hours, intermittent liquid and gas return appears at the return outlet, the duration is about 15 minutes, but the liquid discharge is unsuccessful.
And 3, pumping liquid nitrogen from the annular space, pumping liquid in the continuous pipe 4, observing pressure and load changes, and attempting to unclamp. Liquid is pumped through the continuous pipe 4 at the discharge capacity of 700L/min, liquid nitrogen is pumped from the annular space to 48MPa, the pump is stopped, the pressure of the sleeve is rapidly reduced to about 18.0MPa, and the suspended weight gradually returns to the near normal tonnage. And adjusting the suspended weight to 3t, rapidly depressurizing the wellhead, and then moving the continuous pipe for 4 to 2533m, wherein the flow-back liquid amount gradually increases from 10L/min to 400-500L/min in the process, and the liquid outlet is continuous. The displacement of the continuous pipe 4 is ensured to be unchanged, the change of the suspended weight is closely concerned, the movable continuous pipe 4 is shortened when the blocking phenomenon exists, the suspended weight is continuously lifted when the suspended weight is normal, and the continuous pipe 4 is smoothly lifted.
In view of the foregoing, it will be appreciated by those skilled in the art that, after reading the present specification, various other modifications can be made in accordance with the technical scheme and concepts of the present invention without the need for creative mental efforts, and the modifications are within the scope of the present invention.
Claims (10)
1. A method for releasing a horizontal well coiled tubing when encountering a card is characterized by comprising the following steps:
Step S 1, when the well mouth is lost and the drill is stuck, increasing the displacement of the positive circulation continuous pipe (4), and if the positive circulation continuous pipe (4) cannot be stuck, entering step S 2;
and S 2, pumping liquid nitrogen into the annular space of the continuous pipe (4) and the sleeve, pumping sand washing drilling and grinding liquid into the continuous pipe (4) until the unclamping operation is completed, stopping pumping if the liquid nitrogen is pumped into the annular space, continuing pumping the sand washing drilling and grinding liquid into the continuous pipe (4) until the phenomenon that the load tonnage of the continuous pipe (4) is increased or the oil and the sleeve pressure difference is reduced occurs, continuing pumping liquid nitrogen into the annular space, simultaneously gradually reducing the pumping displacement of the continuous pipe (4) until the suspended weight of the continuous pipe (4) is basically normal, and then lifting the displacement of the continuous pipe (4) and moving the continuous pipe (4) up and down until the unclamping operation is completed.
2. The method for releasing the horizontal well coiled tubing in the event of a stuck condition according to claim 1, wherein the coiled tubing (4) is pressed down to be in a compressed state before sand washing drilling and grinding liquid is pumped into the coiled tubing (4).
3. The method for releasing a horizontal well coiled tubing when encountering a clamp according to claim 1, wherein the overpressure specifically exceeds a preset overpressure protection value, and the overpressure protection value is lower than a casing pressure limit.
4. The method for releasing the horizontal well coiled tubing when the horizontal well coiled tubing is blocked according to claim 1, wherein liquid nitrogen is pumped into an annulus in the liquid nitrogen pumping process until the pressure value gradually tends to a stable value, and if the pressure value of the annulus liquid nitrogen is reduced by more than 5MPa, the liquid nitrogen is continuously pumped into the annulus, and the pressure value is maintained to be the stable value.
5. The method for releasing the horizontal well coiled tubing when encountering the blockage according to claim 1 is characterized in that if the oil and sleeve pressure difference is increased in the process of releasing the blockage, the pumping displacement of the coiled tubing (4) is improved.
6. The horizontal well coiled tubing stuck-encountering and stuck-releasing system is characterized by comprising liquid nitrogen pumping equipment and sand washing drilling and grinding liquid pumping equipment, wherein the liquid nitrogen pumping equipment is used for pumping liquid nitrogen into an annular space of a coiled tubing (4) and a sleeve, and the sand washing drilling and grinding liquid pumping equipment is used for pumping sand washing drilling and grinding liquid into the coiled tubing (4) while pumping the liquid nitrogen.
7. The horizontal well coiled tubing jamming and unlocking system is characterized in that liquid nitrogen pumping equipment comprises a liquid nitrogen source (1), a first communicating pipe (2) and a first flowback valve (3) which are sequentially connected, the other end of the first flowback valve (3) and a coiled tubing (4) are communicated with a sleeved annulus, a liquid nitrogen pump truck (5) and a first plug valve (6) are further arranged on the first communicating pipe (2), sand flushing, drilling and grinding liquid pumping equipment comprises a sand flushing, drilling and grinding liquid storage tank (7) and a second communicating pipe (8) which are sequentially connected, the other end of the second communicating pipe (8) is communicated with the coiled tubing (4), and a pump truck (9) and a second plug valve (10) are further arranged on the second communicating pipe (8).
8. The horizontal well coiled tubing jamming and unlocking system according to claim 7, further comprising a third communicating pipe (11), wherein a third plug valve (12) is further arranged on the third communicating pipe (11), a fourth plug valve (13) is further arranged on the second communicating pipe (8), one end of the third communicating pipe (11) is communicated with the first communicating pipe (2) between the first plug valve (6) and the first flowback valve (3), and the other end of the third communicating pipe is communicated with the second communicating pipe (8) between the fourth plug valve (13) and the second plug valve (10).
9. The continuous pipe sticking system for horizontal wells according to claim 8 is characterized in that a filter (14) is further arranged on the second communicating pipe (8).
10. The horizontal well coiled tubing stuck-relieving system according to claim 9 is characterized by further comprising a second flowback valve (15), a blowout choke manifold (16) and a sand setting tank (17) which are sequentially connected, wherein the second flowback valve (15) and the coiled tubing (4) are communicated with the annular space of the sleeve, and the other end of the sand setting tank (17) is connected with a sand washing drilling and grinding liquid storage tank (7) through a fourth communicating pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311119573.1A CN119553977A (en) | 2023-09-01 | 2023-09-01 | Horizontal well coiled tubing stuck releasing method and stuck releasing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311119573.1A CN119553977A (en) | 2023-09-01 | 2023-09-01 | Horizontal well coiled tubing stuck releasing method and stuck releasing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119553977A true CN119553977A (en) | 2025-03-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311119573.1A Pending CN119553977A (en) | 2023-09-01 | 2023-09-01 | Horizontal well coiled tubing stuck releasing method and stuck releasing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119553977A (en) |
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2023
- 2023-09-01 CN CN202311119573.1A patent/CN119553977A/en active Pending
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